10-4: What Does It Mean?
Have you ever heard someone say "10-4" and wonder what it means? You're not alone! This phrase has been used for decades, but its origins and meaning might surprise you.
What does 10-4 mean?
10-4 is a phrase used to confirm receipt of a message, especially in radio communication. It originated in the 1940s among radio operators and has since become widely used in various contexts. When someone says "10-4," they're essentially saying "I understand" or "Message received."
Where did 10-4 come from?
The phrase "10-4" comes from the APCO radiotelephony spelling alphabet, also known as the "ten-code." This alphabet was developed in the 1940s by the Association of Public-Safety Communications Officials (APCO) to help clarify radio communications.
In this alphabet, "10-4" represents the phrase "affirmative" or "okay." It was often used by radio operators to confirm they had received a message correctly.
How is 10-4 used today?
Today, "10-4" is used in various contexts, including:
- Radio communication: Among ham radio operators, pilots, and emergency responders to confirm receipt of a message.
- Trucking and transportation: Among truckers and dispatchers to acknowledge messages or confirm arrival times.
- Informal conversation: As a casual way to say "I understand" or "Got it."
Fun fact: In 1977, the American country music band C.W. McCall wrote a song called "Convoy," which prominently featured the phrase "10-4." This song became a huge hit, further popularizing the term.
In conclusion
Next time you hear someone say "10-4," you'll know it's more than just a random phrase. It's a nod to the history of radio communication and a convenient way to acknowledge receipt of a message.
